I've been working on a macro to do character animation. It is similar to
Mike Williams' sweep mesh work, only this one allows for any spline as the
cross section along each point. Thus  instead of a "worm" one can have a
thigh shape, a calf muscle shape, a lower calf shape, etc.   It may also
seem like I'm doing a bunch of funny business with redefining my splines
back and forth, but this allows me to have a smoothly varying radius.

But as you can see, something is going haywire when it has to bend over!

(scene file to p.b.s-f.  image file to p.b.i.)

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